
There doesn't appear to be much in the way of carbon deposits from leaks on the flexi.
Does look a bit tatty but keep an eye on it like Rob says, it might need attention in future.
When putting together the slide joints, sand the smaller side with some 80 or 180 grit and they will go together quite easily. they should be a tight fit so exhaust paste on top might make the job harder. I didn't have any paste on the slide joints before. You could also heat the bigger side of the joint with a blowtorch to expand it before fitting.

The joint closest to the decat needs to go in a fair bit as well, as it is desiged to work with UK and JDM cats.
Dave.